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SHANGHAI BELLING |
BLI9182
4.3V to 18V Input, 2.0-ASynchronous Step-Down Converter with Fast Transient Response
Features
2.0-A Output Current
High Efficient Integrated FETs Optimized for
portable application:
95mΩ (High side) and 90mΩ (Low side)
High Efficiency
Up to 95% Efficiency @ 5V Input, 3.3V Output
Up to 93% efficiency @ 12V Input, 3.3V Output
Wide Input Voltage Range: 4.3V to 18V @ 2.0-A
loading
Wide Output Voltage Range: 0.918V to 14V @
2.0-A loading ( 32Watt output @max)
Low Output Ripple and Allows Ceramic Output
Capacitor
Thermal Shutdown Protection
340-KHz Switching Frequency(fsw)
Cycle By Cycle Over Current Limit
+/-1.5% High Accuracy Feedback Voltage
Applications
Wide Range of Applications for Low Voltage
System
- Digital TV Power Supply
- High Definition Blu-ray Disc Players
- Networking Home Terminal
- Digital STB
- Ideal for Portable Applications
Descriptions
The BLI9182 is a current mode synchronous
buck converter, and has a proprietary W-mode™®
Gm curvature circuit that enables fast transient
response, enables the device to adopt to both low
ESR output capacitors, such as POSCAP or
SP-CAP, and ultra-low ESR ceramic capacitors.
The BLI9182 operates from 4.3-V to 18-V Vin
input, and the output voltage can be programmed
between 0.918V to 14v with 2.0A output current,
and +/-1.5% high accuracy output voltage.
Due to 95mΩ (High side) and 90mΩ (Low side)
integrated FETs, the BLI9182 works in high
efficiency (up to 94% @12V Input, 3.3V output) .
Typical Application
Input 4.3V – 18V
C3 10nF
C1
10µF/25V
Ceramic
C8
0.1µF
R4 100K 2
1
IN
7
EN
BS 3
SW
8 FB 5
SS COMP G
64
C4
3.3nF
R3
2.2K
L1 10µH
R1 26.1K
1%
R2 10K
1%
Output
3.3V 2.3A
Cout
22µF/6.3V
Ceramic
X2
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PIN ARRANGEMENT
BS 1
IN 2
SW 3
G4
8 SS
7 EN
6 COMP
5 FB
BLI9182
PIN FUNCTIONS
NAME
BS
PIN
NO.
1
IN 2
SW 3
G
FB
COMP
4
5
6
EN 7
SS 8
Description
Deatails
Supply input for high-side NFET gate driver (boost terminal). Connect capacitor from
this pin to SW pin. An internal PN diode is connected between VREG to BS pin.
Power input and connected to high side NFET drain
Switch node connection between high-side NFET and low-side NFET. Also serve as
inputs to current comparators.
Signal ground pin, also serve as ground returns for low-side NFET.
Converter feedback input. Connect with feedback resistor divider.
Compensation Node. Used to compensate control loop. Connect a series RC
network from COMP to G. In some cases, an additional capacitor is required
Enable control input
Soft-start control. A external capacitor should be connected to G.
ABOSOLUTE MAXIMUM RATINGS
Over operating free-air temperature range (unless otherwise noted)
ITEMS
NAME
VALUE
IN -0.3 to 20
BS -0.3 to 25
Voltage Range
SW
SW (10 ns transient)
-2 to 20
-2.5 to 21
FB,SS,COMP
-0.3 to 5.5
EN -0.3 to 8
TJ
Operation Junction
-40 to +150
Tstg
Storage temperature
-55 to +150
UNIT
V
V
V
V
V
V
℃
℃
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